Double check your temperatures and hiding spots and whatnot. If you feed f/t mice (or fuzzies or whatever) I'd suggest making it very warm by running it under warm water to make it seem more alive. How big is your sav again? Make sure she has enough water and is hydrated. Triple check your temperatures. If she's big enough you could always try a rat pink or pup. Something a little different that's still available. I don't know much to tell you other than to double check your temps and try new food (that's readily available). Our sav just went through a major growth spurt and is slowing down/not eating as much. Has me a little worried but he isn't losing weight yet. Also if you can, try to actually weigh your sav (containers work great for this). That way you can actually track how much weight she's losing. A few grams wouldn't necessarily be of concern but this way you could physically look and be able to show a vet if it came to that. Those are just thoughts/suggestions. I'm sure someone more experienced than I will reply.
~Katie
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2.4 Cornsnakes (Slink, Shadow, Suzie, Snickers, Selena, Sunshine)
0.1 Columbian Red Tail Boa (Baby)
0.3 Leopard Geckos (Cutie, Lily, and Miss Piggy)
0.1 Savannah Monitor (Sam)
0.2 Pac Man Frogs (Gordito and Spud)
0.1 Suriname Toad (Squishy & the Squishettes)
0.0.2 Giant Millipede (Mega & Mila)
0.0.1 Green Iguana (Iggy)
0.0.1 Red Eared Slider (Tiny)
lots of snails and fish...